Personally I don't think you really need a breather. If your tube is long enough no oil will climb that high. And a clogged breather will just increase pressures. I used an old stainless dune biggie fuel tank I had. Worked great.
The trick is to lengthen the cap at the breather vertically by about 12 inches. That should work.

I went ahead and installed a 1" vent, 2' long, coming out of the top of the tank. We'll see how that works. Headed out to southern AZ right after Christmas. That should be enough miles to get a handle on it.